本文介绍了如何检查对象的类型是否是 C++ 中的特定子类?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!
问题描述
我正在考虑使用 typeid()
但我不知道如何询问该类型是否是另一个类的子类(顺便说一下,它是抽象的)
I was thinking along the lines of using typeid()
but I don't know how to ask if that type is a subclass of another class (which, by the way, is abstract)
推荐答案
你真的不应该.如果您的程序需要知道一个对象是什么类,这通常表明存在设计缺陷.看看你是否可以使用虚函数获得你想要的行为.此外,有关您正在尝试执行的操作的更多信息会有所帮助.
You really shouldn't. If your program needs to know what class an object is, that usually indicates a design flaw. See if you can get the behavior you want using virtual functions. Also, more information about what you are trying to do would help.
我假设你有这样的情况:
I am assuming you have a situation like this:
class Base;
class A : public Base {...};
class B : public Base {...};
void foo(Base *p)
{
if(/* p is A */) /* do X */
else /* do Y */
}
如果这是你所拥有的,那么尝试做这样的事情:
If this is what you have, then try to do something like this:
class Base
{
virtual void bar() = 0;
};
class A : public Base
{
void bar() {/* do X *
本站部分内容来源互联网,如果有图片或者内容侵犯您的权益请联系我们删除!